the client does keep track of the watches that it has outstanding. when it reconnects to a new server it tells the server what it is watching for and the last view of the system that it had.

ben

On 08/16/2010 09:28 AM, Qian Ye wrote:
thx for explaination. Since the watcher can be preserved when the client
switch the zookeeper server it connects to, does that means all the watchers
information will be saved on all the zookeeper servers? I didn't find any
source of the client can hold the watchers information.


On Tue, Aug 17, 2010 at 12:21 AM, Ted Dunning<ted.dunn...@gmail.com>  wrote:

I should correct this.  The watchers will deliver a session expiration
event, but since the connection is closed at that point no further
events will be delivered and the cluster will remove them.  This is as good
as the watchers disappearing.

On Mon, Aug 16, 2010 at 9:20 AM, Ted Dunning<ted.dunn...@gmail.com>
wrote:

The other is session expiration.  Watchers do not survive this.  This
happens when a client does not provide timely
evidence that it is alive and is marked as having disappeared by the
cluster.




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